Lecture
This lecture covers the concepts of material strength and hardness, discussing the behavior of materials under different conditions such as ductility, plastic deformation, and fracture. It explains how dislocations and chains movement affect the resistance of metals, ceramics, and polymers. The instructor also explores hardness testing methods like Vickers and Brinell, as well as the relationship between hardness and elastic limit. Additionally, the lecture delves into the toughness of materials, emphasizing the importance of crack propagation and the impact of constraints on material behavior.